Furnace for heating purposes



2 Sheets-Sheet 1. A. JAHANT.

FURNAGE FOB. HEATING PURPOSES. I

Patented Nov. 25, 1890.

V(No Model.)

(No Model.)

' 2 Sheets-Sheet 2.

A. JAHANT. FURNAGB FOR HEATING PURPOSES.

l Patented Nov. 25,1890.

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UNITED STATES PATENT OFFICE.

AUGUSTUS JAHANT, OF AKRON, OHIO.

FURNACE FOR HEATING PURPOSES.

SPECIFICATION forming part of Letters Patent N o. 441,567, dated November 25, 1890.

Application filed May l0, 1'890. Serial-NoIv 351,277. (No model.)

To @ZZ whom t may concern.'

Be it known that I, AUGUSTUS J AHANT, of Akron, in the countyT of Summit and State of Ohio, have invented certain new and useful Improvements in Furnaces for Heating Purposes; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others .skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in furnaces'for heating purposes; and it consists in certain features of construction and in combination of parts, hereinafter described, and pointed out in the claims.

f In the accompanying drawings, Figure lis a vertical section through the center of the furnace. Fig. 2 is a front elevation. Fig. 3 is a plan in section on line 0c Fig. 4 is a plan. Fig 5 is an enlarged detail, in section, of an improved coupling.

A represents the inner wall of the furnace, this furnace being provided with grate A', lire-pot A2, combustion-chamber A3, ash-pit a, and doors a a2, all of which may be of ordinary construction.

B is the outer casing inclosing a hot-air chamber B, the latter connecting with the coldair duct (not shown) leading usually to the outside of the building.

K 1s a'box, preferably of sheet metal, located inside the hot-air chamber B', preferably between the line of doors a a2, this box being adapted to t and bear against wall A, to which it is secured. An air-duct C extends from outside the furnace through a hole in casing B and discharges into box K. From the two upper corners of the box K lead pipes C C', these pipes extending up for some distance inside chamber B as shown, and from thence extend through holes in the furnace, where they connect with extension-pipes C2, these latter pipes extending down inside of and close to wall A to or near to the surface of the fuel, and from thence pipes C2 turn inward toward the ,center of the furnace, so that the air-cuirents discharged from these pipes are directed over the top of the fuel and the two air-currents cross each other approximately at the center of the furnace. Pipes O2, being located,'as aforesaid, inside the furnace, will eventually burn out and have to be renewed. Hence these pipes are preferably of cast-iron, and for readily attaching and detaching the saine I provide as follows:

Pipes C are usually of wrought metal and are screw-threaded for connecting with couplings c, each coupling having an external flange c', adapted to bear against the outer side of wall A, the coupling being also provided with a lock-nut c2, adapted to engage the inner surface of the wall A. Pipes C2 iit easily over the inner ends of coupling c, and are held in place by means of, for instance, pins c3. By withdrawing a pin a pipe C2 may be removed and new pipes substituted, the change requiring but a few minutes of time. The outer end of pipe C is provided with a gravity-damper C3, this damper being connected by means of cord or chain D with a similar damper e of smoke-pipe E, chain D engaging suitable sheaves d, the arrangement being such that in closing one damper the other damper is opened. In starting the fire damper C3 is opened wide, and after the fire is under way this damper may be more or less closed to control the iire. After the building has become sufficiently warm, at least in moderate weather, the damper C3 will likely be closed and damper e opened wide, more especially overnight or when the furnace is to be left for several hours without attendance.

In operating the furnace, doors a a2 aie kept closed, except as the one door is opened for supplying fuel and the other door is opened for removing ashes. rlliese doors should be well fitted, so that when closed they will admit little or no air. ln stai'ting the furnace, the fire-box having been supplied with coal, the kindlers are placed on top of the coal and ignited, and as soon as they are well under way door a is closed, damper C3 having been previously opened. The heat of the burning kindlers produces a strong currentof air through pipes C, box K, and pipes C C2, and as the furnace becomes heated, box K from its contact with the furnace-walls becomes highly heated, and also pipes C', being located inside the hot-air chambei' becomes heated to a high degree, by reason of which the air passing through these pipes and box becomes raised to a high tempera- IOO ture, and hence a hot-air blast is discharged into the furnace. The two currents of hot air, meeting approximately at the center of the furnace and just at or above the surface of the fuel, produce an eddying movement or whirlpool that gathers into its vortex the gases from the fuel, and the comi'ningling of hot air and gases just where the heat is most intense results in a perfect combustion of these elements, and it is found that much better results accrue than with a single current of air admitted for such purpose.

That I claim is* l. The combination,with a furnace having a fire-pot, a closed combristicii-chamber, and a smoke-pipe leading out of the upper end of the latter for the discharge of the products of combustion and having means for excluding air from the grate, of two or more induetion air-pipes extending into the combustionchaniber, and adapted to discharge into the furnace at or near the surface of the fuel, and from different points the arrangement of the induction air-pipes being such that the currents of air will cross or engage cach other at or near the center of the furnace, substantially as set forth.

2. The combination, with a furnace having an outside casing inclosing a hot-air chamber, of a metal box located in such hot-air chamber, a cold-air duct adapted to discharge into such box, two or more hot-air pipes leading from such box and discharging into the furnace from different points, so thatthe currents of air will engage or cross each otl1er,

a gravity-damper over the cold-air duct, a gravity-damper for closing an air-opening in the smoke-pipe, and a iexible connection between the two dampers, whereby when one damper is opened more or less the other is correspondingly closed, substantially as set forth.

In testimony whereof l sign this specifica tion, in the presence of two witnesses, this 28th day of March, 1890.

AUGUSTUS JAITAN'l. Witnesses:

C. H. Donna, WILL B. SAGE. 

